JP2000332829A - Reception data quantity control method in telephone system, device therefor and storage medium recording its method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reception data quantity control method and a device by which a reception terminal such as an Internet video phone can control a reception data quantity from a transmission terminal and efficient real time data communication is attained without interrupted sound and disturbance in an image. SOLUTION: When a reception terminal recognizes that fluctuation in a packet loss or a packet exceeds a prescribed value in the case of real time data communication, the reception terminal transmits a data quantity change request packet to a transmission terminal on the opportunity of discrimination by an Internet telephone software itself or discrimination by a user. When the transmission terminal receives it, the transmission terminal discriminates the real time data transmission method by which the revision of the transmission data quality can be made, and when the revision is possible, the transmission terminal transmits the packet by the real time data transmission method. When the revision is unreasonable, the transmission terminal transmits a data quantity revision reject packet to the reception terminal without changing the transmission data quantity. When the reception terminal receives the packet, the reception terminal terminates the processing to recognize the reception state or the user operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an Internet videophone system for performing two-way real-time data communication over an IP network such as the Internet.
The present invention relates to a method and apparatus for controlling the amount of received data by a real-time data receiving terminal, and a storage medium on which the method is recorded.

[0002]

2. Description of the Related Art In an Internet videophone, in order to reduce the amount of data flowing on a network, audio data and image data are generally encoded (compressed), then packetized, and transmitted to the other party ( (FIG. 12). Therefore, in an Internet videophone, at the start of communication, both parties exchange the coding schemes they have, recognize the coding scheme that the other party can play back, transmit it using the coding scheme that the other party can play back, and send real-time data. Communication takes place.
As a system for this purpose, ITU-TH. 323 / H. The H.245 system is typical.

The amount of data used in real-time data communication differs in voice communication depending on the type of voice coding used. In addition, input voice data is encoded in a certain amount (= frame) unit. The packetization is performed, and the amount of data differs depending on the packet formation unit (frame size). This packet formation unit has a different base value for each encoding method.
For example, the G.100 compresses audio to 6.3 kbps or 5.3 kbps. 30ms (millisecond) in the 723.1 system, 8
G. compress to kbps. In the 729 system, it is 10 ms. Normally, if the speech is encoded and packetized for each multiple of the base frame size serving as the base, the number of transmitted packets can be reduced. For example,
G. FIG. In the case of the 723.1 system, 6 which is a multiple of 30 ms
For example, 0 ms, 90 ms, and 120 ms. If the packet formation unit is 120 ms, G. 723.1 compressed audio data is transmitted to the other party as one audio data packet (FIG. 1).
3).

[0004] In image communication, the amount of data differs depending on the image coding system used. In addition, the unit of sending out the input image data as a packet is frame unit, G unit.
It is possible to packetize in OB units, MB units, or a plurality of each, but the data amount also differs depending on the packet formation unit (FIG. 14). In addition, parameters of frame rate / image quality are determined at the start of image encoding, and image data is encoded with the parameters. The data amount also differs depending on the values.

In IP network communication, when packetizing compressed real-time data, packetization is performed by adding header data for a communication protocol. However, since the size of the header is a fixed value regardless of the size of the encoded data, The smaller the packet formation unit, the larger the number of packets created, the larger the overhead of the header portion, and the larger the amount of data flowing through the network even when the same encoding is used. As an example, speech coding G. FIG. 15 shows the difference in the amount of transmission data depending on the packet formation unit of 723.1.

On the other hand, in an actual Internet communication line, since the amount of data (communication speed) differs depending on the type of line, use of an Internet videophone in an environment with a low communication speed may be considered. Further, even when the same communication line is used, the communication speed may temporarily decrease, for example, when the network is crowded. In such a case,
In the case of audio data, it is effective to change the audio encoding and to reduce the overhead by increasing the packet formation unit. In the case of image data, it is effective to change the image encoding and the frame rate / frame rate. It is effective to change the image quality parameter, increase the packet formation unit, reduce the overhead, and reduce the amount of transmission data.

There is an RTP / RTCP communication control method as a means by which the transmitting terminal recognizes the real-time data reception status. In the RTP / RTCP communication control method, the RTP packet transmitting side adds a sequence number and a time stamp to the RTP header. ing. The sequence number is incremented by one for each RTP packet each time it is transmitted, and is used on the receiving side to detect packet discard. The time stamp contains the time when the RTP header was generated, and the receiving side recognizes the network fluctuation by the following formula.

[0008] S represents a time stamp time given by the transmission side, and R represents an RTP packet reception time. The difference between the transmission time interval (Sj-Si) and the reception time interval (Rj-Ri) of packets i and j is D (i, j) = (Rj-Ri)-(Sj-Si) = (R
j-Sj)-(Ri-Si). The following calculation is performed each time packets i and i-1 are received.

J = J + (| D (i−1, i) | −J) / 16 J indicates the fluctuation of the packet. The real-time data reception status obtained on the receiving side is notified to the transmitting side by an RTCP packet.

[0010]

However, in the above-mentioned conventional technology, H.264 is used as a notification method when notifying the amount of data to be used. 323 / H. In the 225 system, there is a method of mutually notifying the amount of data that does not include a communication protocol header, but differs from the actual amount of data because it does not include the bandwidth of a header such as IP. Also, RTP /
In the RTCP communication control method, it is possible to notify the real-time data reception status to the transmitting terminal, but it is left to the transmitting terminal whether the transmitting terminal changes the transmission data amount.

Therefore, there is no means for changing the data amount from the transmitting terminal according to the judgment of the real-time data receiving terminal, and the compressed / packetized compressed data packet is unilaterally transmitted according to the judgment of the transmitting terminal. .

As a result, the amount of received data cannot be changed by the judgment of the receiving terminal based on the receiving condition, and the receiving terminal may experience a break in sound or disturbance of an image. Alternatively, there has been a problem that an optimal audio image cannot be provided.

According to the present invention, the receiving terminal cannot change the amount of received data at the discretion of the receiving terminal, so that the receiving terminal suffers from interruptions in the sound or disturbance of the image, or cannot provide an optimal sound image. In a telephone system such as an Internet videophone, the receiving terminal can control the amount of data received from the transmitting terminal at the time of real-time data communication. Without disturbance etc.,
And efficient real-time data communication becomes possible,
It is an object to provide a reception data amount control method and apparatus, and a storage medium on which the method is recorded.

[0014]

In order to solve the above-mentioned problems, a reception data control method according to the present invention provides a network (for example, an IP network) in which a plurality of terminals are accommodated with respective addresses (for example, IP addresses). In a telephone system (for example, an Internet telephone system), a receiving terminal monitors a sequence number and a time stamp (for example, a sequence number and a time stamp in an RTP header) given to received data at the time of real-time data communication. Recognizing one or both of packet loss and packet fluctuation from the sequence number and the time stamp as the reception status, and receiving data when one or both of the packet loss and fluctuation exceeds a certain value due to the real-time data reception status. When it is determined that the amount change processing is necessary, a data amount change request is sent to the transmitting terminal, and when the transmitting terminal recognizes the data amount change request from the receiving terminal, the coding that can be used during a voice call is performed. The amount of real-time data transmission data is changed by changing the packet formation unit that can be transmitted and received in the encoding method or the encoding method. If the transmission data amount cannot be changed, the real-time data transmission data amount is not changed, and the data amount is changed. Sending a rejection to the receiving terminal.

Alternatively, in a telephone system in a network in which a plurality of terminals are accommodated with respective addresses, a step of recognizing at a receiving terminal that a received data amount changing operation has been performed by a user operation during real-time data communication. Sending a data amount change request to the transmitting terminal when the received data amount changing operation is recognized; and, when the transmitting terminal recognizes the data amount changing request from the receiving terminal, using the data amount changing request during voice communication. The amount of real-time data transmission data is changed by changing a possible encoding method or a packet forming unit that can be transmitted and received in the encoding method. If the amount of transmission data cannot be changed, the amount of real-time data transmission data is not changed. And transmitting a data amount change rejection to the receiving terminal.

Alternatively, in a telephone system in a network in which a plurality of terminals are accommodated with respective addresses, a receiving terminal monitors a sequence number and a time stamp given to received data at the time of real-time data communication. Recognizing one or both of packet loss and packet fluctuation from the sequence number and the time stamp as data reception status; and receiving if one or both of packet loss and fluctuation exceeds a certain value due to the real-time data reception status. When it is determined that data amount change processing is necessary, a data amount change request is sent to the transmitting terminal, and when the transmitting terminal recognizes the data amount change request from the receiving terminal, a code usable during image communication is transmitted. Rate or image rate in the encoding method or the encoding method The real-time data transmission data amount is changed by changing the parameters or the packet formation units that can be transmitted and received in the encoding method. If the transmission data amount cannot be changed, the real-time data transmission data amount is not changed. Sending a rejection to the receiving terminal.

Alternatively, in a telephone system in a network in which a plurality of terminals are accommodated with respective addresses, the receiving terminal recognizes that the received data amount changing operation has been performed by a user operation during real-time data communication. Transmitting a data amount change request to the transmitting terminal when the received data amount change operation is recognized, and recognizing the data amount change request from the receiving terminal at the transmitting terminal. The real-time data transmission data amount is changed by changing a usable coding system, a frame rate / image quality parameter in the coding system, or a packet forming unit that can be transmitted and received in the coding system, and the transmission data amount cannot be changed. If so, the real-time data transmission data amount is not changed and a data amount change rejection is sent to the receiving terminal. And having a step for.

[0018] In the telephone data system according to the present invention, a plurality of terminals each having an address are accommodated in a telephone system in a network. Means for monitoring a sequence number and a time stamp that are present, and recognizing one or both of a packet loss and a packet fluctuation from the sequence number and the time stamp as a real-time data reception status; and Means for determining that the received data amount change processing is necessary when one or both of the fluctuations exceeds a certain value, and having a means for sending a data amount change request to the transmitting terminal; Coding method and formation of packets that can be transmitted and received in the coding method Means for recording the position, and real-time data transmission by recognizing the data amount change request when receiving the data amount change request from the receiving terminal, and changing the encoding system or a packet forming unit that can be transmitted and received in the encoding system. It is characterized in that it has means for changing the data amount, and means for sending a data amount change rejection to the receiving terminal without changing the transmission data amount if the transmission data amount cannot be changed.

Alternatively, in a telephone system in a network accommodating a plurality of terminals each having an address, a receiving terminal recognizes that a received data amount changing operation has been performed by a user operation during real-time data communication. Means for sending a data amount change request to the transmitting terminal when the received data amount changing operation is recognized, an encoding system which can be used by the transmitting terminal during a voice call, and a packet which can be transmitted and received in the encoding system Means for recording the formation unit, and real-time data by recognizing the data amount change request when receiving the data amount change request from the receiving terminal and changing the coding scheme or the packet formation unit that can be transmitted and received in the coding scheme. Means for changing the amount of transmission data, and real-time data transmission data if the amount of transmission data cannot be changed Of without changing, and having a means for transmitting the data amount changing denied to the receiving terminal.

Alternatively, in a telephone system in a network accommodating a plurality of terminals each having an address, a receiving terminal monitors a sequence number and a time stamp given to received data during real-time data communication, and Means for recognizing one or both of packet loss and packet fluctuation from the sequence number and the time stamp as data reception status, and receiving when one or both of packet loss and fluctuation exceeds a certain value due to the real-time data reception status. Means for determining that data amount change processing is necessary, and sending a data amount change request to the transmitting terminal, wherein the transmitting terminal uses an encoding system usable for image communication or a frame rate / image quality in the encoding system. Transmission / reception is possible with the parameter or the encoding method Means for recording a packet formation unit, and recognizing the data amount change request when receiving a data amount change request from a receiving terminal, and executing the coding method or a frame rate / image quality parameter in the coding method or the coding method. Means for changing the amount of real-time data transmission data by changing the packet formation units that can be transmitted and received, and if the transmission data amount cannot be changed, the real-time data transmission data amount is not changed and the data amount change refusal is rejected. And a means for sending to

Alternatively, in a telephone system in a network in which a plurality of terminals are accommodated with respective addresses, a receiving terminal recognizes that a received data amount changing operation has been performed by a user operation during real-time data communication. Means for sending a data amount change request to the transmitting terminal when the received data amount changing operation is recognized, and a coding method usable for image communication by the transmitting terminal or a frame rate / image quality in the coding method. Means for recording a parameter or a packet forming unit that can be transmitted / received in the encoding method, and a data amount change request recognized when a data amount change request is received from a receiving terminal, and a frame rate in the encoding method or the encoding method By changing the image quality parameter or the packet formation unit that can be transmitted / received in the encoding method. Means for changing the amount of real-time data transmission data, and means for sending a data amount change rejection to the receiving terminal without changing the amount of real-time data transmission data if the amount of transmission data cannot be changed. .

A program for causing a computer to execute the steps in the above-described method for controlling the amount of received data in the telephone system may be recorded on a computer-readable storage medium and provided or distributed. It is possible.

According to the present invention, a data amount change request is sent to the transmission terminal when the receiving terminal makes a judgment based on packet loss or packet fluctuation or a user makes a judgment. When you receive
By changing the amount of real-time data sent to the receiving terminal, it is possible for the receiving terminal to control the amount of data received from the transmitting terminal during real-time data communication. Lost
In addition, it enables efficient real-time data communication.

[0024]

Embodiments of the present invention will be described below in detail with reference to the drawings.

As a first embodiment of the present invention,
FIG. 1 shows a block diagram of an Internet videophone terminal.

Reference numeral 101 denotes an apparatus control unit which controls the following units in cooperation with each other. Reference numeral 102 denotes an Internet telephone function / control unit, which controls transmission and reception of data in the Internet telephone, and controls the amount of received data in the receiving terminal. In the transmitting terminal, audio and images from the microphone / camera (103) are input from the input unit (104), and A
Is converted into digital data by a / D conversion unit (105),
The data is encoded by the encoding unit (106) and passed to the transmission data control unit (112). Transmission data control unit (112)
The communication control unit (11)
4), transmitting to the partner transmitting terminal via the network interface unit (115). On the other hand, in the receiving terminal, the received data control unit (111) receives the packet data received via the network interface unit (115) and the communication control unit (114), and decodes the received packet data.
0), the signal is converted into an analog signal by a D / A converter (109), passed through an output unit (108), and presented as audio / image on a speaker monitor (107).

In this embodiment, the Internet videophone terminal records the coding system that can be used by the terminal during a telephone call and the packet forming unit that can be transmitted and received in the coding system, and uses the code when using an image. And a data amount control processing recording unit (113) for recording a frame rate / image quality parameter in the image format. The Internet telephone function / control unit (102) has the following one or two means.

1. Means for monitoring the sequence number and the time stamp in the RTP header at the time of real-time data communication at the receiving terminal, and recognizing packet loss and packet fluctuation from the sequence number and the time stamp as the real-time data reception status; and
Means for determining that the received data amount change processing is necessary when the packet loss or fluctuation exceeds a certain value depending on the real-time data reception state, and transmitting a data amount change request to the partner terminal.

2. Means for changing the received data amount by a user operation during real-time data communication, means for recognizing that the received data amount changing operation has been performed, and changing the data amount to the partner terminal when the received data amount changing operation is performed A means to send a request.

When the terminal itself is the transmitting terminal, the Internet telephone function / control unit (102) recognizes the data amount change request when receiving the data amount change request, and executes the coding method or the coding method. A means for changing the real-time data transmission data amount by changing the frame rate / image quality parameter when using packet forming units and images that can be transmitted and received, and without changing the transmission data amount if the transmission data amount cannot be changed, Means for sending data amount change rejection.

In the embodiment, the Internet videophone terminal is a network interface (IF).
And a terminal connection device for connecting an analog telephone or the like using an analog line to a network, and a personal computer in which Internet videophone software for realizing each of the above means is installed.

FIG. 2 shows a sequence example of a call for requesting a data amount change of the Internet videophone in the embodiment. FIG. 3 shows a processing flow at the time of a data amount change request in the present invention.

At the time of real-time data communication, the real-time data receiving terminal determines whether the receiving terminal itself, for example, the application of the Internet telephone software itself, or the user determines from the packet loss and the fluctuation of the packet. On the other hand, a data amount change request packet is transmitted. Upon receiving the data amount change request packet, the transmitting terminal determines a real-time data transmission method capable of changing the amount of data to be transmitted, and if possible, transmits the packet using the changeable real-time data transmission method. If it is impossible, the transmission data amount is not changed, and the data amount change rejection packet is transmitted. FIG. 4 shows an example of the data amount change request packet, and FIG. 5 shows an example of the data amount change rejection packet. Upon receiving the data amount change rejection packet, the real-time data receiving terminal ends the process of recognizing the reception status or the user operation.

As described above, by transmitting the data amount change request packet from the receiving terminal, it is possible to reduce sound interruption or image disturbance between Internet videophones in consideration of network conditions, or to achieve high quality audio / video Can be provided.

FIG. 6 shows a second embodiment of the present invention. The present embodiment is an example of a case where a data amount change process is performed according to a real-time data reception state during voice communication.

A data communication terminal 1 (601) and a data communication terminal 2 (602) are connected on a network (LAN), and a microphone (60) is connected to the data communication terminal 1 (601).
1a), a speaker (601b) is provided, Internet telephone software (601c) is installed, and the data communication terminal 2 (602) is provided with a microphone (602a), a speaker (602b), and Internet telephone software (602c). Are installed, and constitute the Internet telephone terminals 1 and 2, respectively.

The data communication terminals 1 (601), 2
At (602), the Internet telephone software is activated. The data communication terminal 1 (60
The IP address of 1) is "129.60.26.11",
The IP address of the data communication terminal 2 (602) is "12
9.60.26.12 ".

The user operates the data communication terminal 1 (601)
In this case, a calling operation is performed using Internet telephone software to establish a voice real-time data communication state with the data communication terminal 2 (602). The voice coding method and the packet forming unit used in the communication are the data communication terminal 1
G. (601) and G. 30 at 723.1
msec. The data communication terminal 1 (601) measures packet loss and fluctuation of real-time data by the reception data control unit from the start of voice real-time data communication. The reception data control unit registers in advance that the packet loss = 3% and the fluctuation = 100 as thresholds for making a data amount change request, and performs data amount change processing when the threshold values are exceeded. When packet loss is measured as 4% in the data communication terminal 1 (601) due to a change in network conditions during real-time data communication, the data communication terminal 1 (601) notifies the transmitting terminal of a decrease in the amount of received data. In order to make a request, the data communication terminal 2 (602) transmits a data amount change request packet (FIG. 7) carrying data amount reduction request information. Upon receiving the data amount change request packet, the data communication terminal 2 (602) recognizes the data amount reduction request based on the information in the packet and sends the data amount change request packet to the data amount control processing recording unit (FIG. 8) to reduce the transmission data amount. Based on the recorded information, the packet formation unit is 30 msec (transmission bit rate of about 2
From 2 kb / s) to 120 msec (transmission bit rate about 10 kb / s), and transmit audio real-time data.

When the packet loss is again measured as 4% at the data communication terminal 1 (601) after the reception data change processing, the data communication terminal 1 (601) notifies the transmission terminal of the decrease in the amount of received data. A data amount change request packet (FIG. 7) loaded with data amount reduction request information is sent to the data communication terminal 2 (602). Upon receiving the data amount change request packet, the data communication terminal 2 (602) recognizes the data amount reduction request based on the information in the packet and sends the data amount change request packet to the data amount control processing recording unit (FIG. 8) to reduce the transmission data amount. Based on the recorded information,
An attempt is made to change the amount of transmitted data, but since the change is not possible, the data communication terminal 1
(601). The data communication terminal 1 (601)
, Upon receiving the data amount change rejection packet, ends the process of measuring the packet loss and fluctuation of the real-time data.

FIG. 9 shows a third embodiment of the present invention. The present embodiment is an example of a case where a user manually performs a data amount changing process during voice communication.

The data communication terminal 1 (901) is provided with a microphone (901a) and a speaker (901b), Internet telephone software (901c) is installed, and the data communication terminal 2 (902) has a microphone (902).
a), a speaker (902b), and Internet telephone software (902c) are installed, each constituting an Internet telephone terminal. The data communication terminal 1
A modem (901d) is connected to (901), and a modem (902d) is connected to the data communication terminal 2 (902). Dial-up connection is made to the Internet provider (903) via the modem. The communication speed of both modems is 28.8 kbps.

In the data communication terminal 1 (901) and the data communication terminal 2 (902), Internet telephone software is started, and both are connected to an Internet provider via a modem, and have obtained IP addresses. State. I of the data communication terminal 1 (901)
The P address is “129.60.26.11”, and the IP address of the data communication terminal 2 (902) is r129.6.
0.26.12 ".

The user operates the data communication terminal 1 (901)
In this case, a calling operation is performed using Internet telephone software to establish a voice real-time data communication state with the data communication terminal 2 (902). The speech coding system and packet forming unit used are the data communication terminal 1 (901),
2 (902). 303.1 msec at 723.1. G, 723.1 system, packet formation unit is 30ms
, The communication data amount is about 22 kbps, so the communication band (2
Even at 8.8 kbps), data transmission and reception can be performed normally without data loss. However, when another data communication is performed during the communication and the communication band for execution is reduced to 15 kbps, the G.264 communication is performed. Data having a size of 723.1 / frame packetization size of 30 ms cannot be transmitted completely, and sound loss due to data loss occurs. Due to this change in network conditions, the user of the data communication terminal 1 (901) determines that the amount of received data is to be reduced due to sound interruption and is difficult to hear, and performs an operation of reducing the amount of received data using Internet telephone software. To request the transmitting terminal to reduce the amount of received data, the data communication terminal 2
A data amount change request packet (FIG. 10) carrying the data amount reduction request information is transmitted to (902). Upon receiving the data amount change request packet, the data communication terminal 2 (902) recognizes the data amount reduction request based on the information in the packet, and sends the data amount control processing recording unit (FIG. 11) to reduce the transmission data amount. Based on the recorded information, the packet formation unit is 30 msec (transmission bit rate of about 2
From 2 kb / s) to 120 msec (transmission bit rate about 10 kb / s), and transmit audio real-time data. The communication band in this communication mode is about 10 kbps
Therefore, even if the effective communication bandwidth is 15 kbps, voice transmission and reception can be performed normally without data loss.

Although the second and third embodiments show an example of voice communication, the present invention can be similarly applied to voice image communication and image communication. However, at the time of audio / video communication or image communication, it is necessary to change the coding method that can be used during image communication, or the frame rate / image quality parameter in the coding method, or the packet formation unit that can be transmitted / received in the coding method. To change the amount of real-time data transmission data. In addition, although milliseconds are used as a packet formation unit, the present invention can be similarly applied to a case where the number of frame packets is used.

It should be noted that some or all of the functions of each unit shown in FIG. 1 can be realized using a computer, or that the computer can execute the processing procedures shown in FIGS. Needless to say, a program for realizing the function of each part in the computer or a program for causing the computer to execute the processing procedure can be stored in a storage medium readable by the computer, such as an FD (Floppy Disk) or the like. , MO, ROM, memory card, CD, DV
D, recorded on a removable disk, provided, and distributed.

[0046]

As described above, according to the present invention,
In telephone systems such as Internet videophones,
At the time of real-time data communication, the receiving terminal itself determines from packet loss or packet fluctuation, or the user determines, and when the transmitting terminal makes a data amount change request to the transmitting terminal, the transmitting terminal receives the data amount changing request. Since the amount of data to be sent is changed, the receiving terminal can control the amount of data received from the transmitting terminal, and efficient and real-time data communication can be performed without sound interruption or image disturbance. It becomes possible.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of an Internet videophone terminal according to the present invention.

FIG. 2 is a diagram showing an example of a sequence at the time of a data amount change request in the first embodiment.

FIG. 3 is a processing flow diagram when the data amount is changed in the first embodiment.

FIG. 4 is a diagram showing an example of a data amount change request packet according to the first embodiment.

FIG. 5 is a diagram showing an example of a data amount change rejection packet in the first embodiment.

FIG. 6 is a diagram showing a second embodiment of the present invention.

FIG. 7 is a diagram showing an example of a data amount change request packet in the second embodiment.

FIG. 8 is a diagram showing an example of a data amount control processing recording unit in the second embodiment.

FIG. 9 is a diagram showing a third embodiment of the present invention.

FIG. 10 is a diagram showing an example of a data amount change request packet in the third embodiment.

FIG. 11 is a diagram showing an example of a data amount control processing recording unit in the third embodiment.

FIGS. 12A and 12B are diagrams showing an example of a basic processing sequence in an Internet videophone.

FIGS. 13 (a) and (b) show the results of G.A. It is a figure which shows the example of the packet formation unit in 723.1 system.

14 (a) and (b) show H.264. FIG. 3 is a diagram illustrating an example of a packet formation unit in the H.263 system.

FIGS. 15A and 15B are diagrams illustrating a difference in transmission data amount between packet formation units.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 ... Device control part 102 ... Internet telephone function / control part 103 ... Microphone / camera 104 ... Input part 105 ... A / D conversion part 106 ... Encoding part 107 ... Speaker monitor 108 ... Output part 109 ... D / A conversion part 110: Decoding unit 111: Received data control unit 112: Transmission data control unit 113: Data amount control processing recording unit 114: Communication control unit 115: Network interface unit 601: Data communication terminal 1 601a: Microphone 601b: Speaker 601c: Internet Phone software 602 Data communication terminal 2 602a Microphone 602b Speaker 602c Internet telephone software 901 Data communication terminal 1 901a Microphone 901b Speaker 901c Internet telephone software 901d Modem 902 Data communication terminal 2 902a: Microphone 902b: Speaker 902c: Internet telephone software 902d: Modem 903: Telephone network (Internet provider)

Continued on the front page F-term (reference) 5C064 AA01 AC01 AC22 AD02 AD08 AD14 5K030 HA08 HB01 KA02 KA19 LA07 LC01 LC07 MB06 MB13

Claims (9)

[Claims] In a telephone system in a network in which a plurality of terminals are accommodated with respective addresses, a receiving terminal monitors a sequence number and a time stamp given to received data at the time of real-time data communication. Recognizing one or both of packet loss and packet fluctuation from the sequence number and the time stamp as data reception status; and receiving if one or both of packet loss and fluctuation exceeds a certain value due to the real-time data reception status. Determining that data amount change processing is necessary and sending a data amount change request to the transmitting terminal; and recognizing the data amount change request from the receiving terminal at the transmitting terminal, the code usable for voice communication. Format or packet formation that can be transmitted and received in the coding system And changing the real-time data transmission data amount by changing the order, and if the transmission data amount cannot be changed, does not change the real-time data transmission data amount and sends a data amount change rejection to the receiving terminal. A method for controlling the amount of received data in a telephone system. 2. In a telephone system in a network in which a plurality of terminals are accommodated with respective addresses, a step of recognizing at a receiving terminal that a received data amount changing operation has been performed by a user operation during real-time data communication. Sending a data amount change request to the transmitting terminal when the received data amount changing operation is recognized; and using the data amount changing request from the receiving terminal when the transmitting terminal recognizes the data amount changing request. The amount of real-time data transmission data is changed by changing a possible encoding method or a packet forming unit that can be transmitted and received in the encoding method. If the amount of transmission data cannot be changed, the amount of real-time data transmission data is not changed. Sending a data amount change rejection to the receiving terminal. Control method. 3. A telephone system in a network in which a plurality of terminals are accommodated with respective addresses, wherein a receiving terminal monitors a sequence number and a time stamp given to received data at the time of real-time data communication. Recognizing one or both of packet loss and packet fluctuation from the sequence number and the time stamp as data reception status; and receiving if one or both of packet loss and fluctuation exceeds a certain value due to the real-time data reception status. Determining that data amount change processing is necessary and transmitting a data amount change request to the transmitting terminal; and recognizing the data amount change request from the receiving terminal at the transmitting terminal. Encoding / frame rate / image quality parameter in the encoding method The real-time data transmission data amount is changed by changing the data or the packet forming unit that can be transmitted and received in the encoding method. If the transmission data amount cannot be changed, the real-time data transmission data amount is not changed. Transmitting a change rejection to the receiving terminal. 4. In a telephone system in a network in which a plurality of terminals are accommodated with respective addresses, a receiving terminal recognizes that a received data amount change operation has been performed by a user operation during real-time data communication. Transmitting a data amount change request to the transmitting terminal when the received data amount changing operation is recognized; and recognizing the data amount changing request from the receiving terminal at the transmitting terminal. The real-time data transmission data amount is changed by changing a usable coding system, a frame rate / image quality parameter in the coding system, or a packet forming unit that can be transmitted and received in the coding system, and the transmission data amount cannot be changed. If there is, the real-time data transmission data amount is not changed, and a data amount change rejection is sent to the receiving terminal. Reception data amount control method in a telephone system and having a floor. 5. In a telephone system in a network in which a plurality of terminals are accommodated with respective addresses, a receiving terminal monitors a sequence number and a time stamp assigned to received data during real-time data communication, and Means for recognizing one or both of packet loss and packet fluctuation from the sequence number and the time stamp as data reception status; and one or both of the packet loss and the fluctuation exceed a certain value depending on the real-time data reception status. And a means for determining that the received data amount change processing is necessary, and a means for sending a data amount change request to the transmitting terminal. Means for recording a unique packet forming unit, and data from the receiving terminal. Means for recognizing the data amount change request at the time of receiving the data amount change request, and changing the real-time data transmission data amount by changing the encoding system or a packet forming unit that can be transmitted and received in the encoding system; Means for sending a data amount change rejection to the receiving terminal without changing the amount of transmitted data if the change is impossible, the receiving data amount control device in the telephone system. 6. A telephone system in a network in which a plurality of terminals are accommodated with respective addresses, wherein a receiving terminal recognizes that a received data amount change operation has been performed by a user operation during real-time data communication. Means for sending a data amount change request to the transmitting terminal when the received data amount changing operation is recognized; an encoding system which can be used by the transmitting terminal during a voice call; and a packet which can be transmitted and received in the encoding system. Means for recording the formation unit; realizing the real-time data by recognizing the data amount change request when receiving the data amount change request from the receiving terminal and changing the coding scheme or the packet formation unit that can be transmitted and received in the coding scheme. Means for changing the amount of transmitted data, and if the amount of transmitted data cannot be changed, Without further, the received data amount control device in a telephone system and having a means for transmitting the data amount changing denied to the receiving terminal. 7. In a telephone system in a network in which a plurality of terminals are accommodated with respective addresses, a receiving terminal monitors a sequence number and a time stamp given to received data at the time of real-time data communication. Means for recognizing one or both of packet loss and packet fluctuation from the sequence number and the time stamp as data reception status, and receiving when one or both of packet loss and fluctuation exceeds a certain value due to the real-time data reception status. Means for determining that data amount change processing is necessary, and sending a data amount change request to the transmitting terminal, wherein the transmitting terminal uses an encoding system usable for image communication or a frame rate / image quality in the encoding system. Parameters or parameters that can be Means for recording a packet formation unit, recognizing the data amount change request when receiving a data amount change request from a receiving terminal, and executing the coding method or a frame rate / image quality parameter in the coding method or the coding method. Means for changing the amount of real-time data transmission data by changing the packet formation unit that can be transmitted and received in the terminal, and if the transmission data amount cannot be changed, the real-time data transmission data amount is not changed, and the data amount change rejection is rejected. Means for transmitting data to a telephone system. 8. In a telephone system in a network in which a plurality of terminals are accommodated with respective addresses, a receiving terminal recognizes that a received data amount changing operation has been performed by a user operation during real-time data communication. Means for sending a data amount change request to the transmitting terminal when the received data amount changing operation is recognized; and a coding method usable in image communication or a frame rate / image quality in the coding method. Means for recording a parameter or a packet forming unit that can be transmitted / received in the coding method, and a data amount change request received upon reception of a data amount change request from a receiving terminal, and a frame rate in the coding method or the coding method. By changing the image quality parameter or the packet formation unit that can be transmitted / received in the encoding method. Means for changing the amount of real-time data transmission data, and means for not changing the amount of real-time data transmission data if the amount of transmission data cannot be changed, and sending a data amount change rejection to the receiving terminal. Device for controlling the amount of received data in telephone systems. 9. A program for causing a computer to execute the steps in the method for controlling the amount of received data in the telephone system according to any one of claims 1 to 4,
A storage medium recording a method for controlling the amount of received data in a telephone system, wherein the method is recorded on a storage medium readable by the computer.